From working with larger companies, this information might come across as disturbing...
Further to Forbairt's comments, which I agree with, I'd draw a distinction between Irish/UK and US businesses
What we've seen (with companies ranging from €9 million pa to €160 million) in an Irish-owned Business.
Head of Marketing (including managing "online") : €45k - €70k (this is no joke, and this is a position for someone with 10+ years)
Junior roles (no experience) are currently being off, quite often with the Jobsbridge programme, many are being turned into a fulltime role
Junior Executive - from €2k per month
Online Manager - from €3k a month
Social Media Manager - from €2.5k
Head of Online - from €3.5k a month
There is a serious disbelief amongst Irish companies in online - that online is merely a digital PR strategy to promote a brand just like a flyer.
Here are two views:
1. We need someone who can translate and talk to the web agency (where the top earners will possibly be on €90k - I'm guessing) and just "manage" this for us ---> avoid
2. We actually believe/need/are addicted to this and want to invest in it ---> go for these guys
There are a number of top end jobs in this scale, which are the ones "we" all read about
Head of online - starting at €95k - €120k
Head of Search - starting at €85 - €125k
In IT, stuff like ASP.net, Sharepoint and Ruby are all above €70k it seems (where experience is enough to be independent)
My 2c - (general advice, not specifically OP, who's background I don't know) - if you're good and can deliver - set up an agency and make your own money.
HTH