The online article “Social Networks: Facebook Takes Over Top Spot, Twitter Climbs” (Compete.com, February 9, 2009) included the accompanying data on number of unique visitors and total number of visits for January 2009 for the top 25 online social network sites.

The data on total visits and unique visitors were used to compute the values in the final column of the data table, in which visits per unique visitor 5 total visits number of unique visitors Site Unique Visitors Total Visits Visits per Unique Visitor facebook.com 68,557,534 1,191,373,339 17.3777 myspace.com 58,555,800 810,153,536 13.8356 twitter.com 5,979,052 54,218,731 9.0681 fixter.com 7,645,423 53,389,974 6.9833 linkedin.com 11,274,160 42,744,438 3.7914 tagged.com 4,448,915 39,630,927 8.9080 classmates.com 17,296,524 35,219,210 2.0362 myyearbook.com 3,312,898 33,121,821 9.9978 livejournal.com 4,720,720 25,221,354 5.3427 imeem.com 9,047,491 22,993,608 2.5414 reunion.com 13,704,990 20,278,100 1.4796 ning.com 5,673,549 19,511,682 3.4391 blackplanet.com 1,530,329 10,173,342 6.6478 bebo.com 2,997,929 9,849,137 3.2853 hi5.com 2,398,323 9,416,265 3.9262 yuku.com 1,317,551 9,358,966 7.1033 cafemom.com 1,647,336 8,586,261 5.2122 friendster.com 1,568,439 7,279,050 4.6410 xanga.com 1,831,376 7,009,577 3.8275 360.yahoo.com 1,499,057 5,199,702 3.4686 orkut.com 494,464 5,081,235 10.2762 urbanchat.com 329,041 2,961,250 8.9996 fubar.com 452,090 2,170,315 4.8006 asiantown.net 81,245 1,118,245 13.7639 tickle.com 96,155 109,492 1.1387

a. A dotplot of the total visits data is shown in Figure EX-1.23a. What are the most obvious features of the dotplot? What does it tell you about the online social networking sites?

b. A dotplot for the number of unique visitors is shown in Figure EX-1.23b. In what way is this dotplot different from the dotplot for total visits in Part (a)?

What does this tell you about the online social networking sites?

c. A dotplot for the visits per unique visitor data is shown in Figure EX-1.23c. What new information about the online social networks is provided by this dotplot?