There are various platforms where you can create and maintain your academic profile, and use it to connect with other researchers.
ORCID is the most highly recommended. It is a nonprofit organisation which provides you with a persistent digital identifier (your unique ORCID iD) that you own and control, to distinguish you from every other researcher. You can connect your iD with your professional information — affiliations, grants, publications, peer review, and more.
Academia.edu, ResearchGate and Mendeley are academic social networking sites where you can share and discuss research outputs (e.g. papers, conference posters, data and code). NB: You are advised not to share your publications via these sites, but are encouraged to upload it to our institutional repository WestminsterResearch instead. Sharing published work on these sites may be in violation of copyright.
The Thesis Whisperer blog is dedicated to the topic of doing a PhD and completing a dissertation
The Research Whisperer describes itself as "just like the Thesis Whisperer – but with more money"
The LSE Impact Blog is for anyone interested in maximising the impact of academic work in the social sciences and other disciplines
Twitter can be a powerful networking and current awareness tool.
The Benefits of Social Media: 6 Twitter Tips for Graduate Students by Jonathan Reardon (PhD student at Durham University and the person behind the @AcademicChatter Twitter account)
Accounts to follow:
see also this blog post
Hashtags to use/follow: