http://www.xmarks.com/topic/lighthouses

This website ranks the number of times a website page is bookmarked. It ranks by different keywords.

In this case, the ranking of websites with the word "lighthouse".

#1 Lighthouse Friends
#2 New England Lighthouses (Jeremy D'entremont)
#3 Lighthouse Directory
#4 Lighthouse People - the Shanklins site
#5 American Lighthouse Foundation
#6 Lighthouse Depot
#7 Lighthouse Getaway
#8 Seeing the Light (Terry Pepper)
#9 Lighthouses to Visit (National Park Service)
#10 Harbour Lights

Lighthouse Keepers comes in at #50, #56 and #62 (multiple bookmarks)