The idea behind all these is similar. Sharing ideas and discussing professional issues with librarians from other organisations is an important tool for professional development. Opportunities to do this have traditionally been limited. We read the professional press and attend the occasional meeting or conference but most of the time we are working on our own. Social networking provides the opportunity to keep in touch with a community of interest from your workplace or home. As with many new developments the critical thing is not mastering the technology but changing our behaviour to take advantage of the new opportunities. Many people would take a half -or full-day, or more, off work to attend a meeting or training event but would find it difficult to spend a few hours a week to sit down in front of a computer and take part in on-line professional discussions. I wonder how many heads of service or training officers encourage their staff to do this during work time as part of their CPD activities.
It is perhaps dissapointing that there are now so many different social networking sites on offer - but there has always been a number of different professional journals available, each with its own remit and coverage. These things grow organically and we can not expect them to conform to a central plan. What is important is that individual professionals and LIS organisations seize the opportunity that is being offered and join in with these networks.