In my case I didn't blog about my personal life; I was living in Tokyo at the time and wrote a blog about seeing people at (Japanese large company) rebuilding everything from scratch and serious cases of NIH. It hit Hacker News and Slashdot Japan, and it also introduced me to a few people in the local Ruby community (which translated to other opportunities, which - many years later - culminated with my previous job at Heroku/Salesforce).
I don't think social media matters as much as being seen as someone who does things when you are in a real social situation. One handshake from an interesting person, like, say, Paul McMahon (who cofounded Doorkeeper and worked on Ruby) or Patio11, felt more important to me than 10k social media likes. (I purposely picked people who had nothing to do with my work career)
I don't know how applicable any of this is, especially with the invasion of nerd spaces by bullies. However, there are always people who need skilled coworkers, and finding sincere places to show these skills will always be helpful.