For getting more value in following/interacting with colleagues on Twitter, particularly in relation to conference/topic hashtags, I recommend setting up an IFTTT.com "filter" to add people who tweet about a particular topic(s) to a Twitter list. This can save a LOT of time hunting, searching, and doing this by hand. Details and an example of this can be found at "Some thoughts on creating conference lists, live tweeting and archiving events" [http://boffosocko.com/2016/10/12/twitter-list-for-dtmh2016-participants-dodging-the-memory-hole-2016-saving-online-news/ ]