It's also interesting to think about how to use social networks/networking if you're the owner of a store or service that people may not want to promote across

It's also interesting to think about how to use social networks/networking if you're the owner of a store or service that people may not want to promote across all of the networks. eg: Debbie probably wouldn't have any trouble recommending a new burger joint she found (except if she was telling everyone she was on a diet, perhaps). But now that Debbie has realised her contributions to social networks leak out further than her intended audience, it's going to be really really hard to convince her to 'Like' that gay bar were her friends work. As someone involved with a few different 'gay bars' (ie, services people like using, but in a lot of cases don't want all(/any!) of their friends/family to know about) it's an interesting problem... And I have no idea what the solution is.