Yes, 23andMe does only SNP testing of all chromosomes, half of mtDNA, all X, most Y, and the 22 autosomal ones. I suggest first making one's profile "public" at 23andMe and provide the surnames and birth places (town and country) of one (great) grandparents without including one's more recent ancestors. That way, predicted 2nd and 3rd cousins can look for matches without extended email exchanges and without revealing any significant identity information. I suggest similar activity using the FTDNA Family Finder. More serious researchers can look for common, extended length segment matches that signify a common lineage more easily at FTDNA than at 23andMe as the latter requires sharing of data and the former provides access directly to one's predicted cousins without sharing. With regard to comparability of the results between RF and FF, they yield quite similar predictions of relationships. sam vass On Oct 26, 2010, Diana Gale Matthiesen wrote: > > As far as I know, 23andMe does only SNP testing, not Y-DNA STR testing (like the standard 67 markers FTDNA). If your purpose is genealogy, you are *far* better > off testing with FTDNA, which has a large and growing stable of genealogically relevant tests available. I would test at 23andMe primarily for medical > reasons. > > One reason to test at FTDNA is that the people getting tested at FTDNA are doing it for genealogical purposes. You are far more likely to get a response from > your matchees at FTDNA than you are at 23andMe. I've been tested at 23andMe, but I did it for medical reasons. I have yet to respond to queries from my > matchees there and likely never will, which is the complaint of many who test there expecting to get responses from their matchees. > > As for the comparability of the RF and FF results, someone else will have to answer that one, because I've yet to attempt a comparison.