How to contact with Fcitx team
Maillist
Directly send email to fcitx-dev at googlegroups.com, and here is the web page version, only first email need to be moderated (sorry for inconvenience, due to large amount of spam).
As for prefered language on this mail list, if you're not Chinese speaker, then English is always prefered, if you're Chinese speaker and not confident with your English, feel free to use Chinese. Since most developer are Chinese people.
Submit patch
All fcitx code already move to github, so if you have some code want to submit, please use github pull request function.
SNS
Twitter: we monitor "fcitx" on twitter global timeline regularly, complain or ask question with fcitx in the sentence, so we can find it and give out some advice.
Please, though you can find some developers' email address easily, don't send email to their private address, this is annoying, and easily to be ignored.