Socialbrowse, the Firefox plugin that lets you surf the Web in a link-sharing social manner, has just re-released its service with a couple of major new features. The Y Combinator-backed startup as been in private beta for some time, and will remain in private beta for a little while longer, but those users testing the service will be able to access and utilize its new features (get your invite below).

Bluepulse, a social network geared exclusively for easy and free messaging among Web-enabled mobile phones, is expanding on its list of compatible devices today with the launch of an application designed to give iPhone owners a custom-fit window to send messages quickly to any number of friends...