In case Likes are a bit too virtual for you, Facebook is continuing to push forward with “buy” buttons. Facebook tells BuzzFeed News that it’s now beginning to build online stores into a small number of business pages. This is only a test for now, but it’s pretty clear where Facebook wants this to go. Online shopping is a huge opportunity: if Facebook can get people to start buying through its platform, it could add a big additional revenue source to supplement ads. Getting people to start doing that is going to be a hurdle, however, and it’s likely that Facebook is keeping the test small until it feels it has the service right.