PageRank, yes, demonstrably. GrapeRank, not even close. Read this, if you haven't yet: View article → > PageRank suffers from several well known methods of attack, most notably the link farm. > Unfortunately, there is no immediately obvious way to incorporate mutes, reports, or other arbitrary sources of data into the PageRank algorithm > if you try to modify PageRank to design a centrality algorithm to address its shortcomings and to implement a certain set of desired characteristics, you'll eventually hit upon something more or less like GrapeRank > - There needs to be a generalizable, clearly defined protocol to incorporate any source of data, not just follows, mutes and reports. For GrapeRank, that method is called intepretation. > - There needs to be a clearly defined protocol to design different metrics with different meanings. One metric to identify health care workers, another metric to rate skill level in some particular activity, etc. > The GrapeRank algorithm was designed specifically with these considerations in mind.