In particular, the invention relates to maintaining {TAIL ~ profiles} of information channels on {HEAD ~ the Web} 
In particular , the invention relates to maintaining { TAIL ~ profiles } of information channels on { HEAD ~ the Web }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD