1. One fairly common “law of web/mobile physics” is the ratio of registered users/downloads to monthly actives, daily actives, and max concurrent users (for services that have a real time component to them).

    I call this ratio 30/10/10 and so many services that we see exhibit it within a few percentage points here and there. Here’s how it works:

    30% of the registered users or number of downloads (if its a mobile app) will use the service each month

    10% of the registered users or number of downloads (if its a mobile app) will use the service each day

    the max number of concurrent users of a real-time service will be 10% of the number of daily users

    We see these ratios across social web apps, social mobile apps, games, music services, and many other consumer web and mobile services.

    — 30/10/10

  2. People are using the app, but they’re not checking in. I asked myself: did we break something? But in fact, it’s because people are using Foursquare to look for where their friends are, to find things, and as a recommendation service. […] the consumption model is actually taking off.

    — Foursquare’s Inflection Point: People Using The App, But Not Checking In

  3. Pinterest is conducive to sharing. There’s a very low barrier to sharing [pins] with everyone who is following you.
    […]
    80 percent of all pins are re-pins, meaning that an overwhelming majority of content shared on site is recycled between users. […] For comparison, just 1.4 percent of tweets were retweets at a similar time in Twitter’s history

    — Pinterest keeps and engages members better than Twitter, data shows

  4. Most Facebook users receive more from their Facebook friends than they give, according to a new study that for the first time combines server logs of Facebook activity with survey data to explore the structure of Facebook friendship networks and measures of social well-being.

    These data were then matched with survey responses. And the new findings show that over a one-month period:

    • 40% of Facebook users in our sample made a friend request, but 63% received at least one request
    • Users in our sample pressed the like button next to friends’ content an average of 14 times, but had their content “liked” an average of 20 times
    • Users sent 9 personal messages, but received 12
    • 12% of users tagged a friend in a photo, but 35% were themselves tagged in a photo […]

    it turns out there are segments of Facebook power users who contribute much more content than the typical user. Most Facebook users are moderately active over a one month time period, so highly active power users skew the average. Second, these power users constitute about 20%-30% of Facebook users, but the striking thing is that there are different power users depending on the activity in question. One group of power users dominates friending activity. Another dominates ‘liking’ activity. And yet another dominates photo tagging.

    — Why most Facebook users get more than they give

  5. 40% of our active users don’t tweet

    — Twitter’s Dick Costolo: “We’re Growing Faster Than We Have Ever Grown Before”

  6. There’s been a perception in the past that in order to use twitter you have to tweet, but actually we have a huge number of users who are just discovering news, discovering breaking events … there’s a way in just by consuming information.

    DLD 2012 - Conversation with Jack Dorsey

  7. When the site really took off was when the curators — people who primarily respond to other Tumblr users’ content by “reblogging” it on their own pages — came on board. Today, creators are probably 10 percent of Tumblr, and curators are 90 percent

    — Tumblr’s Inflection Point Came When Curators Joined Creators

  8. Just 0.16% of all visitors to YouTube upload videos to it, and 0.2% of visitors to Flickr upload photos.

    — The 90-9-1 Principle

  9. We found that 85% of the content in the system was generated by users who login more than 25 days a month … that’s around 20% of users in the system. But we realized that if you start optimizing for these power users, that’ll be invariably at the expense of our more casual users.

    — Adam Mosseri | Data Informed, Not Data Driven

  10. Although the average Facebook user is only communicating directly with four of their 130 friends in any given week, they are consuming content from a much larger number of those people.

    — We communicate with four, but consume from many more.