On: See how many times a URL has been shared on Facebo...

[siculars]

I use that on my HN mashup... http://hnfluence.com/

Also my nyt mashup... http://influentialtimes.com/

[marcuskaz → siculars]

What API/URL do you use to get the bit.ly counts?

[seancron → marcuskaz]

Probably the bit.ly API: http://code.google.com/p/bitly-api/wiki/ApiDocumentation

[siculars → seancron]

That's the one. All the api's I'm using here return json. The only tricky part when dealing with these api's is making sure the json can be parsed, trapping errors, making sure variables exist before calling them... that kind of thing.