Based on my experience in handling a clients off-page Search Engine Optimization (SEO), these are the most useful Press release sites.
They are listed below in any order, as discovered:
www.ukprwire.com
Links: Only include a link at the bottom of the press release under “related website”
Deeplink HTML text: No. Do not include deeplinks.www.sbwire.com
Links: Include a link in the company profile and in the press release.
Deeplink HTML text: No. Do not include deeplinks.www.freepressindex.com
Links: Use deeplinks
Deeplink HTML text: Yes. Include only one link. Use HTML editor.www.postafreepressrelease.com
Links: Use deeplinks.
Deeplink HTML text: Yes. Use HTML codewww.ideamarketers.com
Links: Only include a link at the bottom of the press release under “related website”.
Deeplink HTML text: No. Do not include deeplinks. Include your keywords in MORE DETAILS ABOUT.www.pr-usa.net
Links: Only include a link at the bottom of the press release under “related website”
Deeplink HTML text: Yes. Include deeplinks.www.prlog.com
Links: Only include links in the press release.
Deeplink HTML text: NO. Do not include deeplinks.www.pr-gb.com
Links: Include a link at the bottom of the press release under “related website” and in the press release.
Deeplink HTML text: Yes. Include deeplinks by using HTML editor and switching from Text Mode to HTML Mode.www.pressmethod.com
Links: Only include a link at the bottom of the press release under company profile.
Deeplink HTML text: No. Do not include deeplinks.www.clickpress.com
Links: Only include a link at the bottom of the press release under “URL”.
Deeplink HTML text: Yes. Include deeplinkswww.live-pr.com
Links: Only include a link at the bottom of the press release under “URL”
Deeplink HTML text: Yes. Include deeplinks by using MS Word and making hyperlinks from keywords.www.pressreleasecirculation.com
Links: Website link included at the top of the page.
Deeplink HTML text: No. Do not include deeplinks. Use your keywords instead of the company name at the bottom of the press release.pressreleases.kcstar.com
Links: Only include a link at the bottom of the press release under “URL”
Deeplink HTML text: No. Do not include deeplinks.www.prfocus.com
Links: Only include a link at the bottom of the press release under “URL” and in the press release.
Deeplink HTML text: No. Do not include deeplinks.www.prwindow.com/
Links: Only include a link at the bottom of the press release under “contact details”.
Deeplink HTML text: No. Do not include deeplinks.www.publicitywires.com/index.aspx
Links: Only include a link at the bottom of the press release under “Media Contact”.
Deeplink HTML text: No. Do not include deeplinks.www.seenation.com
Links: Include a link at the bottom of the press release under “contact details” and in the press release.
Deeplink HTML text: Yes. Include deeplinks by using the HTML editor. For more information see PDF file (Submitting-SEO-Press-Releases).www.techprspider.com
Links: Only include a link at the bottom of the press release under “URL”.
Deeplink HTML text: No. Do not include deeplinks.www.thomasnet.com
Links: Include a link at the bottom of the press release under “Contact details” and in the press release.
Deeplink HTML text: Yes. Include deeplinks by using MS Word and making hyperlinks from keywords.www.prmac.com
Links: Only include a link at the bottom of the press release under “company profile”.
Deeplink HTML text: Yes. Include deeplinks by using HTML Code.www.pressbox.co.uk
Links: Only include links in the press release.
Deeplink HTML text: Yes. Include deeplinks.www.openpr.com
Links: Include links at the bottom of the press release under ”URL” and in the press release.
Deeplink HTML text: No. Do not include deeplinks.www.theopenpress.com/
Links: Only include a link at the bottom of the press release under “contact details”.
Deeplink HTML text: No. Do not include deeplinks.
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Coffee Addict. Certified Inbound Marketing Professional and Educator. SEO Expert. Social Media Strategist. Husband. Father. Managing Director, RLCOMM International. President, Cebu Bloggers Society. Mentor, StartUp Weekend. Community Manager, Google Developers Group (GDG) Cebu. 
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