THEWEEK.CO.UK - Nov 21 - How and why people fall in love is still not entirely clear. Scientists are aligned in saying that opposites don't generally attract. Rather, we tend to love people who share our values and outlook on life and who are of similar age and attractiveness. Falling in love is a slow process that can take months, but recognising the potential for love can happen quickly. It takes seven seconds or less to form a first impression of somebody and know whether there is a spark. Humans make unconscious judgements using visual cues. With dating apps however, we have to rely on static photographs and written conversations. Badoo users tend to match with similarly aged people and with those of similar popularity. The attraction happens after the swiping process. But Badoo users tend to message just 50% of their matches so swiping "yes" is therefore not necessarily an indicator of attraction. When the messaging starts, it takes users around two days and 20 messages to decide whether to date someone. This is slower than in person, which is why Badoo encourages its users to go on dates early.