A few ideas:
- LinkedIn username that matches text of domain name
- Twitter handle that matches text of domain name
- Google results for "specialise in _________" (replace the ________ by the keyword or keyphrase in the domain name, and leave the double quotes there)
- Google results for "specialises in _________"
- Google results for "specialists in ________"
- Google results for "_________ specialist"
- Google results for "_________ specialists"
- Google results for "experts in ________"
- Google results for "________ expert"
- Google results for "________ experts"
- Google results for inurl:__________ (if the domain is 2+ words, don't add the spaces; either way, don't add the extension)
- Google results for intitle:"___________" (if the domain is 2+ words, you need the double quotes around the phase; scan through the first few pages of results, looking for sites where A) the result is the ROOT i.e. TOP page from the site and B) the text in the title and snippet suggests that it's a company whose main business is _________)
- Search for companies on Duedil.com or similar where your domain name is a match/partial match to their company name
- Do a Google search for "______.____" (i.e. the full domain name, in quotes; this should turn up results for any company with a longer hyphenated domain in which the last part of the name matches your domain. For example if your domain is greensocks.co.uk then search "greensocks.co.uk" and you would see a results for
www.red-and-greensocks.co.uk if that site existed; unfortunately that doesn't work well for unhyphenated domains)