LinkedIn
Register and create a profile, then search for nutrition or other groups to follow. It is also good for job hunting and keeping up with various products and company announcements.
ResearchGate
Once you've registered, you may follow particular researchers and topics. You can post, read, and answer questions within topic sections. It will notify you via email of new publications from your institution and list its researchers, which you may select to follow. For instance, Jose Ordovas of HNRCA and
President Monaco are members. You can also bookmark particular publications to find out when they are cited or new resources are added to them.
Twitter
Make an account and sign up for these and other feeds.