As said in the title of the book it is a book about dating sites and apps. The author investigates and discusses digital dating with regard to class, age (young men and older women often have a hard time finding heterosexual partners), how different and in what sense it is different from dating before internet dating was a thing, attributes which leads to success, if we are seeing a sexual recession, the different norms for women and men on how to behave on dating platforms, the (non)importance of correct spelling for different groups, if online dating has lead to an hook up culture, and so on. She also takes care to interpret and try the data against sociological theories.
The major strength and weakness of the book is that it is mostly based on Bergström's own research. It is both quantitative research (mostly data from Meetic and some public resources) and qualitative research (interviews with primarily French users of said services). It is a strength as she is intimately familiar with the research she presents to the reader and it isn't just repetition of data presented in other books. The problem is that her research is a bit narrow as it is focused on the French dating market and Meetic Group is the only dating service from which she has gained access to data. While a lot of what she says falls in line with what I have read in other sources and books, her own general conclusions seem a bit overstretching if based on her own research.
More than a few times she does references other works and data, but often it is often very general summaries of studies where I would have liked to see a more careful presentation of the data. It would then have felt more like a general book on digital dating in the western world instead of "digital dating on Meetic sites and apps in France".
One of my favorite parts of the book is chat between two homosexual men who never talked to each other before in one hour and like 50 messages set up a sex meeting and discusses very sexually explicit acts they will do. Bergström claims it is representative for homosexual men, but I would have liked to see some more examples and also some examples of chat logs between heterosexuals and lesbians as comparison.
To Bergström a lot of the most catchy and "alarmist" theories on what online dating has done to society and dating is overblown. She argues the biggest difference with online dating is a shift to a more privatized and explicit way to meet sexual/romantic partners. Instead of meeting partners through friends and family, digital dating makes it easy to "hide" romantic contacts until the person herself/himself is ready to reveal it to family and friends and that in online dating common friends often is a deal breaker rather than a positive. At the same time the ambiguity in meeting someone at a party is replaced by clear intentions when talking on a dating site.
Even though I claimed it is a bit narrowly focused the data and analysis Bergström provides isn't radically different from other books I read on the subject I think it really can be read as a more general book on the subject. For people interested in sociological theory this is a great first book on the subject as she takes care to discuss the data through sociological theories.