There’s actually a final tactic you can try with Twitter to check the past tweets of users. By using the All My Tweets app, you can generate a list up to 3200 of past tweets from anyone for free.
Here’s how to use it:
Go to All My Tweets and log in with your Twitter account.
Then enter the Twitter handle of the website or person you’d like to connect with to get their tweets.
Once you have these listed out, just hit Ctrl/Cmd+F and search for stuff like @domainname, “contact”, “email”, “you can reach me at”, and other variations that might show an email address.