Primarily implicit, but things like "I trust this person to curate this kind of content for me" could be useful to add additional weighting to WoT calculation. But it has to be something people will bother to maintain.
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WoT is a heuristic, it doesn't need to be exhaustive. One way to state the goal is to remove 98% of what the user doesn't want to see, and produce recommendations that are more than 10% likely to be relevant. Implicit web of trust is enough for that. Explicit additions may be a useful addition, but probably won't ever result in more than a 1% improvement (still huge) over either metric above.