Hi Delinda,
I would definitely recommend against tracking (or trying to track) "source" by Account. 2 reasons:
#1 - Since lead source (or "source") is really more relevant to an individual, and you could potentially have multiple individuals (or contacts) connected to an account, which "source" would you select as the primary, and how would you do this. It would have to a manual process - which doesn't scale.
#2 - If you start going down the "rabbit hole" of tracking account source, then add another data element to the metrics you useto determine which source is your greatest value. This could potentially skew your data. For example, let's say you have an Account with the lead source of "web form" and 4 contacts within the account, of which 3 were sourced from "web form" and the other was sourced from social media (hence the account holding the "web form" value). In this case, you would actually be skewing the data towards "web form" being the higher producing source. A more pronoucned skew would start to occur as your database grows.
Just my 2 cents. I would stick to sourcing on a individual basis only.
John
LeadMD