Today at Tripbirds we realized that you can see how many monthly users other social sites have, simply by typing their name in the Facebook search box. Quite obvious perhaps… but also an extremely powerful tool to size up the (social) competition.

Here’s a search for social travel-related sites:

Considering Tripbirds hasn’t actually launched yet… I think we’re doing alright!

The numbers show how many of a site’s users have connected to Facebook in the last month. On some sites you can sign up with or without Facebook - so in those cases you might want to take the numbers with a pinch of salt. It’s a cool indiction though, and you can dig deeper if you like. Since Tripbirds is built on data from Facebook, Foursquare, Gowalla and Instagram, we did a search on those services as well: 

As you can see, Foursquare and Instagram are both huge, while Gowalla seems to be trailing behind a bit. We also did a search for some other social startups, where we know the founders. Most of them Swedish. Here you go:

That Spotify is big you probably knew. But it’s also cool to see that so many connect to Soundcloud with Facebook each month. Soundcloud really has some huge real engagement.

It would be cool to see more examples right? If you do some lists of your own, please ping us and we’ll link to your comparisons. Tell us in the blog comments or ping us. We’re @tripbirds on Twitter.