|LinkedIn endorsements, accumulated after five years of blogging, writing, speaking, etc.|
LinkedIn also provides opportunities for diversity of work, which contributes to experience on a whole, proves invaluable and maintains the profession of being a DBA across platforms (or DBA polyglot as I have pushed), even if only minimal tasks executed over a few days here and there accumulate into a personal body of knowledge which bloggers can benefit from themselves, as well as the contribution to community. Inside organisations, I encourage DBAs to post blogs to demystify our profession and approach, as well as help educate Developers and elude some pretty foul code.
The other improvement, although not that recent, is that LinkedIn is much like a blog platform too, since you can share almost anything. It is method to make a pillar of the all-important (in this net-oriented generation), Online Persona.