How important is web-presence to researchers? How does its importance vary by fields? (My interest is STEM, theory in particular)
I noticed that there is a pretty large variation in amount of web-presence even within a single field (I will use theoretical computer science/related math as an example). There seems to be 3 different levels of web-presence:
[High] Very active member of various internet tools (MathOverflow, cstheory, blogs, G+, etc) usually accompanied by a clear homepage with all the [Medium] info.
[Medium] A clear up-to date website that provides a clean bibliography/CV (usually with links to self-hosted pdfs), a repository of course-notes and teaching information, and list of students.
[Low] No personal website (or extremely outdated website).
Increasing your web-presence usually requires effort. Should you invest this effort? Or are you just wasting research time?
If you enjoy being active on the internet (so it is not a cost for you, but maybe a time-sync) is there any danger to having a high web presence?