What is the best way of keeping track of academic readings and persons?
Although you are aware of this already, I feel I need to state how satisfied I am with mostly using google scholar + a feed reader + a bibliography manager for this. Although it is not integrated, I don't currently feel any need to search for a better all in one platform.

I use google reader to subscribe to RSS feeds for online first and published articles for journals I am interested in (any reader which you can organize feeds into folders and search should be fine - I suspect many have better search capabilities that google reader). The vast majority of journals this is not much of a time suck to read all the titles and peruse abstracts I am interested in. The most prodiguous publications (e.g. Science/Nature) are only borderline annoying with 60+ posts a week, but even that is not that difficult to quickly navigate through.

I have a few fairly specific google scholar alerts (as well as general google alerts), so as to not get too much in my inbox. I basically have a few key words in articles specific to my research interest, and I have alerts for specific authors. I also have alerts to people who cite my articles.

I use CiteULike to manage my bibliography + personal database on my local machine to export various formats (e.g. bibtex or specific citation format). This has the added benefit that I can send articles directly from google reader to citeulike, but I suspect the same set-up could be crafted for other bibliography managers (Zotero, Mendeley) and possible other feed readers.



Basically in a nut-shell,  


feed reader to stay up to date with newly published articles in journals I am interested in,  
google scholar alerts for potentially related material that isn't in those journals, and  
a bibliography manager to store articles to read later on.