It's up to your employer. If they hire you then you represent them. McDonalds could probably care less, but hire end companies would care. It's not wrong to know who you hire.
information should you avoid posting on social networking sites?
You should obtain a patent on your invention before posting it, in order to protect your intellectual property. Then you can talk about it on social media sites.
No, There are no need to allow social sites in schools.
Birthday
Nipples
If you enjoy social media sites, then you should get a Myspace account.
FacebookMySpaceTwitterAny Social Networking Sites.
YouTube, MySpace, Favebook, Flickr, Picasa, and other social sites these are the easy social sites.
scope of social networking sites
Try to search what are the social networking sites and sign up in those sites.
In simple terms - diversity ! Social media web-sites have different facilities - which are not universally useful. Some facilities might be useful to one person - but not to others, meaning that prospective users should 'try out' the different web-sites before opting for the one that suits them best.
I think you should use all popular social networking sites.