Tip: Every Wednesday there is an ELT-related discussion on Twitter, and a volunteer who participated in the discussion writes a summary afterwards. The summaries are then posted here:
Scroll right down to ‘Older Entries’ at the bottom to see all the discussions. Here’s just a flavour of what is already there: mixed ability classes; fossilized errors; activating vocabulary.
The home page of the site linked to above says that it is “a ready-made PLN for ELT Professionals”. (PLN = personal learning network). You need know nothing at all about Twitter to read these summaries – they are for everyone.
Note that the summaries have a great variety of styles, depending on who wrote them.